Dual chamber diaphragm pump



FIG. 1 is a perspective view of a dual chamber diaphragm pump showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines depict portions of the dual chamber diaphragm pump in which the design is embodied that form no part of the claimed design. 

CLAIM The ornamental design for a dual chamber diaphragm pump, as shown and described. 